Fastener



April 27, 1943. E. L, MACK 2,317,787

FASTENER Filed April 18, 1942 las 25 ,6 ge f8 \S` ,o /?8 26 N g L" 24a \N l :zzz u `v HWHI M 2 ,$7,454-

' INVENTOR. Qa/Wam .Mac B n UNITED STATES -PATENr 1 OFFICE g rAs'rENnn Edward L. Mack, NewYork, N. Y. Application April 1s, 194.2, semi 10,439,465 c.

, 9 Claims.

This inventionrelates generally to a new and improved fastening device adapted for detachably `fastening together two separate parts or sheets of material, and the invention particularly xed position underfspringtension bymeans of a fastener or coupling generally indicatedkas I4.

`The fastener I4 comprises two 'main parts namelya rotatable stud member I6 and a corelates to an improved airplane c owl fastener, or 5 operative cross-bar member I8 which is normally fastener adapted to serve in a related manner for relatively stiff but is resiliently and. integrally Y holding readily detachable sheet metal parts in mounted at its ends to coil springs 28 and 22 and close proximity under spring tension, kwith the is positioned over and across opening 23 in plate f provision of predetermined travel -limit means. I2. Stud member" I6 is joined to plate member Particularly, my invention relates to an im- 10 I0 by grommet 24 which rides in a reducedporprovement in respect tov that class of fastening tion of stud I6 and cross-bar member I8 is device described and claimed in Letters Patent joined to plate member I2by rivets 26. If desired, #1,955,740 issued April 24, 1934, to William Dzus 'a grommet 24a may be positioned on 4plate mem? wherein two parts are held together under spring ber I2V and plates I0iand` I2 may be, asindicated, tension by virtue of a spirally tracked tubular l5 slightly separated by blocks 28 which are united vrotatable stud member and a cooperative reto plate I2 by virtue of rivets 26'. i

siliently mounted cross-bar locking member. My n As described in the above identified Dzus Patinvention involves substantially improving this ent #1,955,740 the tubular rotatable stud is arclass of fastener by adding thereto a definitely ranged by virtue of its spiral tracks and its sensitive travel limit means, preferably by form- 2o detent 32 to interlock the resiliently mounted l ing the same integrally with the resilient crosscross-'bar member I8 by virtue of approximately f' bar member, thereby preventing any collapse of one quarter of a clockwise turn,-- thus uniting the fastener due to a deformation of the crossplates I8 and I2 under spring tension and plac-` bar beyond its elastic limit, or alternatively, prelng cross-bar I8 in detent 32. Counter-clockwise,iV Y venting a too wide separation of the plate mem- 25 turning of the stud releases cross-bar I8 from bers which it is sought to join together in closely deent 32. i Y adjacent relatignship under spring tension Additionally, in order to limit theseparation of An objecilof the invention is to provide a fnsplate members Ill and I2 and to permit the use. tener of this type which has a, minimum f parts, if desired, of somewhat lighter stock, cross-bar which is Veconomical to vmanufacture and to as- 30 member I@ in Frg- 11 is integrally P rOVdedWth a f semble, and which is easily susceptible o f critical travel 11111115 means YWhichV Cmprlses two turn-- travel limit adjustments in the process of manubacks 0r transverse folds 34 and 35 respectively facture, thus giving desired optimum results in m the bar and which' dependent upon the both manufacture and use. amount of the turn-back, critically determine the With` the above and other objects in view, my amPunt of denectmn possible inthe resuierltly invention will be readily understood from a premounted cross-bar ,la 'before the travel 1mm ferred illustrative embodiment hereinafter demeans or folds 34 sind 36 impinge upon the plate scribed mzconnection with the accompanying I2, thus thereafter giving arconnectionbetween, drawing which, it is to be understood, is not to be 0 flaesplagtand '2 which is substantially mexlble Y l 4 n s s. A Y denmgeaifg the scopeuof my invention' Therefore it will be understood I `have dls- Y Fig. 1 is a cross section of a fastener embodying ssbgangglbrpgpsgloaeggg l Izig'ninvention with the parts in interlocked posimay be arrangd to impmge ,upon plate, I2' under y Fig. 2 is a section Similar to Fig. 1 of an :web 45 stress, and thus provide a travel limit means re- Y stricting thel relative movement of the spring nate embodiment of my invention with the fasmounted member mand the plate M y v Y u tener Partsrn mterlocked positron In Fig. 2, wherein common parts above Vdef 'Ihe embodiment of my invention ShOWIl` in scribed are'given common numerals the fastener Fig. 1, is an improvement upon that fastening operates in a precisely similar fashion and pre- A' device described and Claimed 111 DZUS Patent cisely similar parts, except that integral travel #1,955,740 above identified, and Fig. 1 may be limit means or folds 34 and 35 we replaced as said to diagrammatically illustrate the yconnecindicated by a. circulartubing member ywhich tion of two plate members I0 and I2 which Vis ispositioned upon cross-bar member I8 and there desired to hold in close proximity and relatively 55 preferably swaged in fixed relation orfpositionV block type might be utilized.

have found strong and economical and easy to place in position. Alternateto'tubing it is obvious that two individual collar means or travel limit stop means of alm'etal washer or square It will Abe recognized that the embodiments of my invention above described are illustrative only and that substitutions of materials and "'-part s,-or'reversals of parts maybe made without avoiding the scope of my invention which is dened in the following claims.

What I claim is:

1. A fastener for detachably fastening two parts together comprising a slotted spiral tracked stud memberrotatably mounted on one of such parts and a resiliently mounted crossbar disposed across an opening in the second of said parts and transverse to said stud member and adapted to cooperate with said stud member to unite the two parts in close lproximity under spring tension and travel limit means connected torsaid cross-bar adapted to limit its travel longitudinally in respect to said stud member.

2. A fastener for detachably fastening ltwo parts together comprising a slotted spiral tracked stud member rotatably mounted on one of such parts and a resiliently mounted cross-bar disposed across an opening in the second of said parts and transverse to saidv stud member and adapted to cooperate with said stud member to unite the two parts in close proximity under spring tension and travel limit means comprisedy of two integral folds in said cross-bar member adapted to limit the travel of said cross-bar longitudinally in respect to said stud member.

3. A fastener for detachably fastening two parts together comprising a y slotted spiral tracked stud member rotatably mounted on one' of such parts and a resiliently` mounted crossbar disposed across an opening in the second of said parts and transverse to said stud member and adapted to cooperate with said stud Y member to unite the two parts in close proximity under spring tension and travel limit means which include a. tubular ring member connected to said cross-bar member adapted to limit the travel of said cross-bar member longitudinally of said stud member. i

4. A fastener for detachably fastening two partsV together comprising a slotted spiral tracked stud member rotatably mounted on: one of such parts and a resiliently mounted crossbar disposed across an opening inthe second of said parts and transverse to said stud mem ber and adapted to cooperate with said stud member to unite the two parts in closegproximity` under spring tensionL and relatively inflexible travel limitmeans connected to said cross-bar adapted to limit its travel longitudinally in respect to said stud member. k

- 5. The combination with two parts *to be fastened together of a fastening device compris- -ing a. spring Amember secured to one of said parts and said part having an opening therein as at 38a. This form of travel limit means I across which said member entends, a slotted spiral tracked stud rotatably connected with the other of said parts, the construction and arrangement being such that the stud may be engaged with said spring member to fasten said parts together, and travel limit means connected to said spring member adapted to limit its travel longitudinally in respect to said stud member.

6. In a fastening device the combination with a. part to be fastened of a stud rotatably connected with said part, said stud having at least one slotted spiral track in the wall thereof positioned tol receive a cooperative resiliently mounted cross-bar, and travel limit means associated withv'said cross-bar adapted to limit the travel of .the cross-bar longitudinally in respect to said stud.

7. A fastening comprising the l combination with parts to be fastened together, one of said parts having an opening therein, of a fastening element;y consisting of an intermediatey straight section, and coils formed respectively on the opposite ends of said straight section, means on the part -having said opening engageable with said coils to secure the element on said part. with the straight section disposed transversely of said opening, slotted turnable Vmeans carried by the other of said parts passing through said opening and engageable with said straight section by turning said last means to detachably fasten said parts together and travel limit means associated with said fastening element adapted to limit'its travel longitudinally in *respect to said turnable means.V

8. A fastener for detachably fastening two parts together comprising a slotted spiral tracked stud member rotatably mounted on one of such parts and a resiliently mounted cross-bar disposed across an opening in the second Aof said parts and transverse to said stud member and adapted to cooperate with said stud memberl to unite the two partsin close proximity under spring tension and travel limit means comprising two integralfolds of the cross bar and which include two portions of said cross-bar bent inwardly towards said second part adapted to impinge upon a relatively iniiexible part of the assembly thereby tc limit the travel of said cross-bar 1ongitudinally in respect to said stud member.

9. In a fastener for detachably fastening two parts together and which includes a spiral tracked stud member adapted to be rotatably mounted on the first of said parts and a resiliently mounted cross-bar adapted to be disposed across an opening in the second of said parts and transverse to said stud member, and to cooperin close proximity under spring tension; travel limit means which include two integral portions of Vsaid cross-bar bent inwardly and adapted to impinge uponV a relatively inflexible part of the assembly thereby to limitV the travel of said crossbar longitudinally in respect to said stud member.

, EDWARD L. MACK.' 

